From: Alexander Nozdrin
Date: March 28 2008 6:46pm
Subject: bk commit into 5.1 tree (anozdrin:1.2579) BUG#32748
List-Archive: http://lists.mysql.com/commits/44616
X-Bug: 32748
Message-Id: <20080328184622.A2DC41D5C89@quad.opbmk>

Below is the list of changes that have just been committed into a local
5.1 repository of anozdrin.  When anozdrin does a push these changes
will be propagated to the main repository and, within 24 hours after the
push, to the public repository.
For information on how to access the public repository
see http://dev.mysql.com/doc/mysql/en/installing-source-tree.html

ChangeSet@stripped, 2008-03-28 21:46:18+03:00, anozdrin@stripped +3 -0
  Fix for Bug#32748: Inconsistent handling of assignments to
  general_log_file/slow_query_log_file.
  
  The problem was that log file path was rejected if directory
  path was empty. The fix is to reject log file path only if it
  is entirely empty.

  mysql-test/r/log_state.result@stripped, 2008-03-28 21:46:17+03:00, anozdrin@stripped +21 -0
    Update result file.

  mysql-test/t/log_state.test@stripped, 2008-03-28 21:46:17+03:00, anozdrin@stripped +28 -0
    A test case for Bug#32748: Inconsistent handling of assignments to
    general_log_file/slow_query_log_file.

  sql/set_var.cc@stripped, 2008-03-28 21:46:17+03:00, anozdrin@stripped +32 -13
    Accept file path if dirname is empty.
    Reject file path if it is empty.

diff -Nrup a/mysql-test/r/log_state.result b/mysql-test/r/log_state.result
--- a/mysql-test/r/log_state.result	2007-12-05 22:33:34 +03:00
+++ b/mysql-test/r/log_state.result	2008-03-28 21:46:17 +03:00
@@ -249,4 +249,25 @@ set global slow_query_log_file= NULL;
 ERROR 42000: Variable 'slow_query_log_file' can't be set to the value of 'NULL'
 set global general_log_file= @old_general_log_file;
 set global slow_query_log_file= @old_slow_query_log_file;
+
+# --
+# -- Bug#32748: Inconsistent handling of assignments to
+# -- general_log_file/slow_query_log_file.
+# --
+
+SET @general_log_file_saved = @@global.general_log_file;
+SET @slow_query_log_file_saved = @@global.slow_query_log_file;
+
+SET GLOBAL general_log_file = 'bug32748.query.log';
+SET GLOBAL slow_query_log_file = 'bug32748.slow.log';
+
+SHOW VARIABLES LIKE '%log_file';
+Variable_name	Value
+general_log_file	bug32748.query.log
+slow_query_log_file	bug32748.slow.log
+
+SET GLOBAL general_log_file = @general_log_file_saved;
+SET GLOBAL slow_query_log_file = @slow_query_log_file_saved;
+
+# -- End of Bug#32748.
 End of 5.1 tests
diff -Nrup a/mysql-test/t/log_state.test b/mysql-test/t/log_state.test
--- a/mysql-test/t/log_state.test	2007-12-05 22:11:57 +03:00
+++ b/mysql-test/t/log_state.test	2008-03-28 21:46:17 +03:00
@@ -231,6 +231,34 @@ set global slow_query_log_file= NULL;
 set global general_log_file= @old_general_log_file;
 set global slow_query_log_file= @old_slow_query_log_file;
 
+###########################################################################
+
+--echo
+--echo # --
+--echo # -- Bug#32748: Inconsistent handling of assignments to
+--echo # -- general_log_file/slow_query_log_file.
+--echo # --
+
+--echo
+SET @general_log_file_saved = @@global.general_log_file;
+SET @slow_query_log_file_saved = @@global.slow_query_log_file;
+
+--echo
+SET GLOBAL general_log_file = 'bug32748.query.log';
+SET GLOBAL slow_query_log_file = 'bug32748.slow.log';
+
+--echo
+SHOW VARIABLES LIKE '%log_file';
+
+--echo
+SET GLOBAL general_log_file = @general_log_file_saved;
+SET GLOBAL slow_query_log_file = @slow_query_log_file_saved;
+
+--echo
+--echo # -- End of Bug#32748.
+
+###########################################################################
+
 --echo End of 5.1 tests
 
 --enable_ps_protocol
diff -Nrup a/sql/set_var.cc b/sql/set_var.cc
--- a/sql/set_var.cc	2008-03-28 18:10:02 +03:00
+++ b/sql/set_var.cc	2008-03-28 21:46:17 +03:00
@@ -2399,32 +2399,51 @@ static int  sys_check_log_path(THD *thd,
   MY_STAT f_stat;
   String str(buff, sizeof(buff), system_charset_info), *res;
   const char *log_file_str;
-      
+  size_t path_length;
+
   if (!(res= var->value->val_str(&str)))
     goto err;
 
   log_file_str= res->c_ptr();
   bzero(&f_stat, sizeof(MY_STAT));
 
-  (void) unpack_filename(path, log_file_str);
-  if (my_stat(path, &f_stat, MYF(0)))
+  path_length= unpack_filename(path, log_file_str);
+
+  if (!path_length)
   {
-    /* Check if argument is a file and we have 'write' permission */
-    if (!MY_S_ISREG(f_stat.st_mode) ||
-        !(f_stat.st_mode & MY_S_IWRITE))
-      goto err;
+    /* File name is empty. */
+
+    goto err;
   }
-  else
+
+  if (my_stat(path, &f_stat, MYF(0)))
   {
-    size_t path_length;
     /*
-      Check if directory exists and 
-      we have permission to create file & write to file
+      A file system object exists. Check if argument is a file and we have
+      'write' permission.
     */
-    (void) dirname_part(path, log_file_str, &path_length);
-    if (my_access(path, (F_OK|W_OK)))
+
+    if (!MY_S_ISREG(f_stat.st_mode) ||
+        !(f_stat.st_mode & MY_S_IWRITE))
       goto err;
+
+    return 0;
   }
+
+  /* Get dirname of the file path. */
+  (void) dirname_part(path, log_file_str, &path_length);
+
+  /* Dirname is empty if file path is relative. */
+  if (!path_length)
+    return 0;
+
+  /*
+    Check if directory exists and we have permission to create file and
+    write to file.
+  */
+  if (my_access(path, (F_OK|W_OK)))
+    goto err;
+
   return 0;
 
 err: